It is reported on temperament tests conducted by the American Temperament Test Society the American Pit Bull Terrier has a current passing rate of 84.1% (December 2006) -- compared to only 77% of the general dog population - even beating Golden Retrievers - 83.8%
Temperament tests consist of putting a dog through a series of unexpected situations, some involving strangers. Any signs of unprovoked aggression or panic in these situations result in failure of the test. (Please visit www.ATTS.org)
Responsible ownership is also the other key to any animals temperament as well. Early socialization, training, exercise, and a loving home with consistent leadership will ensure a happy and wonderful companion.
What if there is a problem?
A Pit Bull that snarls, lunges, or growls at humans is not typical of the breed, and to keep such a dog endangers people and the image of the breed.
If a Pit Bull or Pit Bull mix shows any signs of aggression towards humans, it is strongly suggested that the dog be humanely euthanized in order to avoid possible human injury.
While this action may seem harsh if you think about the damage one unstable, ill-bred Pit Bull does to the entire breed this action is completely acceptable. This isn't to say if you think your dog could be human aggressive you run to your vet and have them put down.
You should take a look at all the possible problems that might be causing unstable behaviour. Almost always in a case where a dog "just snaps" or "turns on their owner" there was a medical problem uncovered that was most likely the cause of the behaviour. If you have a dog that is acting unpredictable or out of sorts, take them to the vet and have them examined.
Content Credit - www.pitbulllovers.com, and http://atts.org/stats1.html